package com.cnc.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebFilter(urlPatterns = {"/add.jsp","/edit.jsp","/student.jsp"},dispatcherTypes = {DispatcherType.FORWARD,DispatcherType.REQUEST})
public class LoginFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest req=(HttpServletRequest) servletRequest;
        HttpServletResponse resp=(HttpServletResponse) servletResponse;
        HttpSession session = req.getSession();
        Object login = session.getAttribute("login");
        if(login!=null){
            filterChain.doFilter(servletRequest,servletResponse);
        }else {
            resp.sendRedirect("index.jsp");
        }
    }

    @Override
    public void destroy() {

    }
}
